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                [Tjoi2013]拯救小矮人                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium;"><span style="font-size: medium;">一群小矮人掉进了一个很深的陷阱里，由于太矮爬不上来，于是他们决定搭一个人梯。即：一个小矮人站在另一小矮人的 肩膀上，知道最顶端的小矮人伸直胳膊可以碰到陷阱口。对于每一个小矮人，我们知道他从脚到肩膀的高度Ai，并且他的胳膊长度为Bi。陷阱深度为H。如果我 们利用矮人1，矮人2，矮人3,。。。矮人k搭一个梯子，满足A1+A2+A3+....+Ak+Bk&gt;=H,那么矮人k就可以离开陷阱逃跑了，一 旦一个矮人逃跑了，他就不能再搭人梯了。<br />
我们希望尽可能多的小矮人逃跑， 问最多可以使多少个小矮人逃跑。<br />
<br />
</span></span></p></p><hr/><h3>输入格式</h3><p><div class="panel panel-default"><span style="font-size: medium;">第一行一个整数N， 表示矮人的个数，接下来N行每一行两个整数Ai和Bi，最后一行是H。（Ai，Bi，H&lt;=10^5）</span></div></p><hr/><h3>输出格式</h3><p><div class="panel panel-default"><span style="font-size: medium;">一个整数表示对多可以逃跑多少小矮人</span></div></p><hr/><h3>样例输入</h3><pre>样例1

2
20 10
5 5
30

样例2
2
20 10
5 5
35</pre><hr/><h3>样例输出</h3><pre>样例1
2

样例2
1</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium;">数据范围<br />
30%的数据 N&lt;=200<br />
100%的数据 N&lt;=2000<br />
<br />
</span></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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